WeChat from China has close to 400 million users, bigger than Line from Japan at over 200 million. These two dominates Asia, at distant third is KakaoTalk from Korea. WeChat is strongest in China, where Line is Japan/Taiwan. WhatsApp and even Facebook has to worry, as all my younger relatives are sharing status/photos in WeChat, abandoning Facebook.

I'm in Sydney but I'm seeing otherwise. Most if not all of my Chinese friends are using WeChat primarily. Sure they may have WhatsApp installed and use them sometime but if they talk to their Chinese friends it always WeChat.

Don't forget the Dutch, it's used by pretty much every smartphone user over here.

Oh I'm sure it is. I've heard it's popular in Southern America as well?

I'm just speaking from my experiance in Australia: WhatsApp is a Chinese thing.

FWIW, WhatsApp is huge in Nigeria; at least the major cities like Lagos.

Everyone in Mexico uses it too